Missing claw

First, stomatopods have ways of dealing with this. If they are missing a single raptorial appendage (2cd maxilliped), there is no modification of the molt cycle and they molt at a normal rate. They usually have no problem feeding, although smashing shells may take a bit longer. If the entire appendage is lost, after one molt there will be a small, poorly colored appendage. It will not be functional. After a second molt, it will be a little more than half size and will move, but not strike very well. After a third molt, it will be 3/4 size and functional (but weaker). After a fourth molt, you won't know the difference. Given that it may be a couple of months or more between molts, it can take up to a year to regenerate the appendage. Juveniles can do it in a couple of months.